Mathematics – Logic
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.480...49d&link_type=abstract
In: Proceedings of the 9th European Space Mechanisms and Tribology Symposium, 19-21 September 2001, Liège, Belgium. Compiled by
Mathematics
Logic
Tribology
Scientific paper
In the context of high accuracy pointing applications, Astrium SAS have investigated, with support of CNES, the use of bearings with silicon nitride balls as an alternative technological solution to the standard lubricated stainless steel ball bearings, in order to reduce as far as possible the torque noise in mechanisms, and to avoid outgassing pollution. Performances of lubricated ceramic ball bearings are available in technological literature, therefore the effort was focused on the search of possible use of low speed rotating ceramic ball bearings without any lubricant, with the goal to achieve or exceed the lifetime performances of standard dry-lubricated stainless steel ball bearings, and to get rid of their on-ground operation constraints. This three-year study exhibits promising results, limited by the behaviour of cage material under dry conditions. No visible wear of neither ceramic ball nor steel or ceramic rings was pointed out.
Di Gesu Frédéric
Sicre Jacques
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